Title

Branching fraction and photon energy spectrum for b→sγ

Document Type

Article

Publication Date

12-3-2001

Abstract

We have measured the branching fraction and photon energy spectrum for the radiative penguin process b→sγ. We find B(b→sγ)=(3.21 ±0.43±0.27 )×10 , where the errors are statistical, systematic, and from theory corrections. We obtain first and second moments of the photon energy spectrum above 2.0 GeV,(E )=2.346±0.032±0.011GeV, and (E )−(E ) =0.0226±0.0066±0.0020 GeV , where the errors are statistical and systematic. From the first moment, we obtain (in the modified minimal subtraction renormalization scheme, to order 1/M and β α ) the heavy quark effective theory parameter Λ 0.35 ±0.08±0.10 GeV. © 2001 The American Physical Society. −0.10 γ γ γ B 0 s +0.18 −4 2 2 2 3 2 ¯

Publication Name

Physical Review Letters

Volume Number

87

Issue Number

25

DOI

10.1103/PhysRevLett.87.251807

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